Enable platform mismatch test again

We now try to pull linux/arm64. The image only exists for linux/amd64, which should
throw the platform mismatch exception.

See gh-44059

Author: mhalbritter

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/dockerTest/java/org/springframework/boot/gradle/tasks/bundling/BootBuildImageIntegrationTests.java

@@ -36,7 +36,6 @@
 import org.apache.commons.compress.utils.IOUtils;
 import org.gradle.testkit.runner.BuildResult;
 import org.gradle.testkit.runner.TaskOutcome;
-import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.TestTemplate;
 import org.junit.jupiter.api.condition.EnabledOnOs;
 import org.junit.jupiter.api.condition.OS;
@@ -515,12 +514,11 @@ void failsWhenCachesAreConfiguredTwice() throws IOException {
 	}
 
 	@TestTemplate
-	@Disabled("Docker is behaving differently on various systems")
 	void failsWithIncompatiblePlatform() throws IOException {
 		writeMainClass();
 		BuildResult result = this.gradleBuild.buildAndFail("bootBuildImage");
 		assertThat(result.getOutput()).contains(
-				"Image platform mismatch detected. The configured platform 'invalid/platform' is not supported by the image 'ghcr.io/spring-io/spring-boot-cnb-test-builder:0.0.3-amd64'. Requested platform 'invalid/platform' but got 'linux/amd64'");
+				"Image platform mismatch detected. The configured platform 'linux/arm64' is not supported by the image 'ghcr.io/spring-io/spring-boot-cnb-test-builder:0.0.3-amd64'. Requested platform 'linux/arm64' but got 'linux/amd64'");
 	}
 
 	private void writeMainClass() throws IOException {

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/dockerTest/resources/org/springframework/boot/gradle/tasks/bundling/BootBuildImageIntegrationTests-failsWithIncompatiblePlatform.gradle

@@ -5,5 +5,5 @@ plugins {
 
 bootBuildImage {
 	builder = "ghcr.io/spring-io/spring-boot-cnb-test-builder:0.0.3-amd64"
-	imagePlatform = "invalid/platform"
+	imagePlatform = "linux/arm64"
 }